Find the missing number in Array

Something Like that:
Find the missing number in Array

add this JS code.

JS

var myArray = [1,2,3,6,1];
//var myArray = [-1,-3];
var missingA;

for(var i=1;i<=myArray.length;i++)
{    
   if(myArray[i-1] != i){
        missingA = i;
        console.log(missingA)
        //alert(missing);
        break;
   }
}

[codepen_embed height="265" theme_id="0" slug_hash="goJPXR" default_tab="js,result" user="pradeepanvi"]See the Pen Find the missing number in Array by Pradeep Kumar (@pradeepanvi) on CodePen.[/codepen_embed]

You can check console.